高炉余能余热驱动ICR Brayton CHP装置的（火用）性能优化  

Exergetic Performance Optimization of an ICR Brayton CHP Plant Driven by Residual Energy and Heat of Blast Furnace

作　　者：杨博[1] 陈林根[1] 孙丰瑞[1] 

机构地区：[1]海军工程大学热科学与动力工程研究室,舰船动力工程军队重点实验室,动力工程学院,武汉430033

出　　处：《热力透平》2013年第3期175-180,共6页Thermal Turbine

基　　金：国家重点基础研究发展计划(973)项目(2012CB720405);国家自然科学基金(10905093)

摘　　要：采用有限时间热力学的思想,建立了高炉余能余热驱动的变温热源不可逆中冷回热(ICR)布雷顿热电联产(CHP)装置模型。以(火用)输出率和(火用)效率为目标优化了装置的性能,发现回热器对(火用)性能的影响在所有换热器中是最小的,当给定回热器热导率分配时,分别存在两个最佳的中间压比和两组最佳的高、低温侧和热用户侧换热器以及中冷器的热导率分配使(火用)输出率和(火用)效率取得最大值。进一步优化总压比,得到了双重最大(火用)输出率和(火用)效率。增大高炉余热源入口温度、压力恢复系数、压气机和涡轮机效率有利于提高装置的(火用)性能,在一定范围内,热用户温度越高越好。最后发现分别存在最佳的工质与热源间的热容率匹配使(火用)输出率和(火用)效率取得三重最大值。Applying finite time thermodynamics, a variable-temperature heat reservoirs irreversible intercooled regenerative Brayton cogeneration plant model driven by residual energy and heat of blast furnace is established. The performances of the plant are optimized by taking exergy output rate and exergy efficiency as the objectives. It is found that the influence of regenerator on the exergetic performances is least among all the heat exchangers. When the heat conductance distribution of the regenerator is given, there exist two optimal intercooling pressure ratios and two groups of optimal heat conductance distributions of hot-, cold-, and consumer-side heat exchangers and intercooler, respectively, which lead to a maximum exergy output rate and exergy efficiency. When the optimization is performed further with respect to the total pressure ratio, the double-maximum exergy output rate and exergy efficiency are obtained. The exergetic performances can be improved by increasing residual heat reservoir inlet temperature of blast furnace, pressure recovery coefficients and efficiencies of compressors and turbine. Within a certain bound, the higher the heat consumer temperature, the better the exergetic performances. At last, it is found that there exist two optimal thermal capacitance rate matching between the working fluid and the heat reservoirs, respectively, which lead to a thrice-maximum exergy output rate and exergy efficiency.

关 键 词：高炉余能余热 有限时间热力学 不可逆中冷回热布雷顿热电联产装置 火(用)性能 优化 

分 类 号：TK12[动力工程及工程热物理—工程热物理]